I don't think I've posted this here in the Yahoo Polysix group yet, but I have designed and built a kit for the Polysix called NoisySix, which I now have more NoisySix upgrade kits in stock.
This is an all analog hardware upgrade for the Korg Polysix that provides Pink and White Noise as well as a 6-waveshape LFO (that inserts itself in place of the original MG circuit). The freq range is very wide (from about 0.005Hz to 100Hz) and has sine, triangle, saw, ramp, square, and S&H.
At this webpage, you'll find specs, pictures, link to purchase, video demos, audio demos and installation instructions.